Toyota CVT Fluid (Comes in 4L tin packing)
ZIC ATF XP III (Available in 1L Packing)
LM Toptech 1400 (Available in 1L Packing)
Passo has very similar gear oil chamber right adjacent to Engine oil chamber and its easy to drain all the oil by unscrewing the bolt underneath. But be careful the oils are very hot when comes out from car (oil change at cold state is not recommended).
Passo gear oil Capacity is slightly more than 3L. its better to fill 3L and check the level with the dip stick. If it shows less, then slightly top it up as required. When its filled, then start the car, put it in the reverse gear for a min. and after that check the dip stick again.
Life of this CVT gear oil is 50K km.